Gadget showing content in wrong size in Mozilla Firefox

Issue Summary

When a user added a gadget like "Sprint Burndown Chart" & "Version Report", Jira rendered the gadget in incorrect size and a certain portion of the content is hidden.

Environment

Jira 8.0.X

Steps to Reproduce

1. Add a Sprint Burndown Chart to a dashboard.
2. Add a Sprint to the gadget.

Expected Results

The gadget displays the full content of the gadget.

Actual Results

Portion of the content in the gadget is hidden:

Notes

Does not affect Jira 7.13.X

Workaround

Users can use Google Chrome which is not affected by this problem.